Amplifier



FIG. 1 is a front elevation view of an amplifier, embodying our new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a rear perspective view thereof;

FIG. 4 is a right side elevation view thereof, the left side elevation view being a mirror image thereto;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for an amplifier, as shown and described. 